Table 1 Confounding variables adjusted for in the model.
From: Solar ultraviolet-B exposure and cancer incidence and mortality in the United States, 1993–2002
Variable | Definition | Source | Geographic Level | Sex-specific | Race-specific |
|---|---|---|---|---|---|
Age | 10-year age groups from 35–44 to 75–84, and 85+ | SEER | County | X | X |
Poverty | % of households below poverty rate | 2000 US Census | County | X | X |
Income | Median household income in dollars | 2000 US Census | County | X | |
Smoking | Age-adjusted lung and bronchus cancer mortality rate | SEER | County | X | X |
Exercise | % with no exercise in last 30 days | BRFSS 1994–2002 (even years) & 2001 | State | X | X |
Alcohol | Average number of drinks in past 30 days | BRFSS 1997, 1999, 2001, 2002 | State | X | X |
Outdoor occupation | % of workers in agriculture, forestry, fishing, hunting, or construction | 2000 US Census | County | X | |
Urban/rural | % rural population Average annual PM2.5 concentrationa | 2000 US Census | County | ||
Air quality | (values for ~ 600 counties known, remainder were interpolated) | US EPA AirNow database 2000 | County |